Heavy -calibre bowling formula float collar

The utility model provides a heavy -calibre bowling formula float collar uses with sleeve pipe, guide shoe cooperation, including tubulose body, center tube, disk seat, valve gap, shear pin seat, elastic mechanism and ball, body upper portion is equipped with the box thread with bushing, and the lower part is equipped with the male thread with bushing, the disk seat includes disk seat and lower disk seat, and the valve gap includes valve gap and valve gap down, the center tube is located internally, and the center tube lower extreme is equipped with the necking down, and the center tube upper end is connected and is gone up the disk seat, going up disk seat rigid coupling in body, being equipped with down the disk seat in the middle of the center tube, the valve gap is connected to the disk seat, and disk seat and valve cover connection locate to be equipped with the elastic mechanism. The radius of ball is less than the center tube radius. The utility model has the advantages of with positive effect be: through the through -flow hole of heavy -calibre of float collar central authorities, make the inside and outside pressure balance of sleeve pipe, saved the process of manual grouting, can transfer the sleeve pipe in addition fast and stable, reduced the case time, reduced acting on the impact force on the stratum simultaneously.